Download the renamed file using PHP

Question

I am making a PHP script that will load a file with a name and version. Files will be stored on the server as follows:

/dl/Project1/1.0.txt /dl/Project1/1.1.txt /dl/Project2/2.3.jar /dl/Project2/2.3.1.jar 

And the paths to extract such files will look like this:

 download.php?name=Project1&type=txt&version=1.0 download.php?name=Project1&type=txt&version=1.1 download.php?name=Project2&type=jar&version=2.3 download.php?name=Project2&type=jar&version=2.3.1 

The problem occurs when downloading files. In this example, I want the first two files to load as Project1.txt, and I want the last two files to load as Project2.jar. How can I rename them temporarily for this to work?

Answer 1

Send a header specifying the file name.

 $filename = $name . "." . $type; header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename=' . $filename); header('Content-Transfer-Encoding: binary'); header('Expires: 0'); header('Cache-Control: must-revalidate'); header('Pragma: public'); header('Content-Length: ' . filesize($file)); 

I have included additional headers, since you must also send them. This is just a modified example of what you can see in the PHP documentation on readfile .

Answer 2

You do not need to rename it, you just need to change the name in the header, there is a script:

 <?php // Check is set all params if (isset($_GET['name'], $_GET['type'], $_GET['version'])) { // Get the params into variables. // Secure replace to avoid the user downloading anyfile like @Kristian Antonsen said. // Replace all '..' to a single '.'; $name = preg_replace('/[\.]{2,}/', '.', trim($_GET['name'])); // Replace any strange characters. $type = preg_replace('/[^A-Za-z0-9]/', '', trim($_GET['type'])); // Replace any letter and strange character. $version = preg_replace('/[^0-9\.]/', '', trim($_GET['version'])); /** * Check is all the params filled with text * and check if the version is in the right format. */ if (!empty($name) && !empty($type) && !empty($version) && preg_match('/^[0-9](\.[0-9])+$', $version)) { /** * Get the file path, here we use 'dirname' to get the absolute path * if the download.php is on root */ $filePath = dirname(__FILE__) . '/dl/' . $name . '/' . $version . '.' . $type; // Check if the file exist. if (file_exists($filePath)) { // Add headers header('Cache-Control: public'); header('Content-Description: File Transfer'); header('Content-Disposition: attachment; filename=' . $name . '.' . $type); header('Content-Length: ' . filesize($filePath)); // Read file readfile($filePath); } else { die('File does not exist'); } } else { die('Missing params'); } } 

Answer 3

You probably want to just use the content-disposition header:

 header('Content-disposition: attachment; filename=Project1.txt'); readfile('Project1/1.0.txt');